When they arrived at the scene, Bai Song, Wang Huadong and Sun Jie put on gloves, rubber caps, hoods and masks and entered the ruins.
The fire department used water cannon to put out the fire, and everything that was burned was destroyed beyond recognition. Most of the physical evidence at the scene and the deceased himself have been taken away by the relevant departments.
The three of them looked at the remaining scene. All the flammable objects had been burned almost completely. Only some glass fragments, burnt fruits, and the residue from some burnt balloons remained. Everything else had been taken away.
…
"This is Inspector Bai from our headquarters." Captain Zhuang introduced Bai Song to the leaders of the Criminal Investigation Brigade of Xijing Branch.
"I've heard of you. You're really young..." Captain Liu shook hands with Bai Song cordially and pointed to a young man next to him: "This is Xiao Zhao, the chief criminal police officer. Ask him about the case."
…
Bai Song shook hands, exchanged some pleasantries, and gained a preliminary understanding of the case, which was that the Xijing Branch did not take it seriously enough, thinking it was an accident, and that the organizer was not a leader.
This made Bai Song a little puzzled. Why did Captain Zhuang come in person to handle this matter?
After learning some details here, Bai Song planned to understand the matter clearly before looking at the physical evidence and witnesses, so he specifically asked Captain Zhuang, as he was afraid of missing any important details.
"This construction site is a key project, and the site blockade here cannot be too long." Captain Zhuang said simply.
Bai Song nodded, understood the reason why Team Zhuang came, and then went with everyone to look at the physical evidence and witnesses.
…
The cause of Yao's death was cardiac arrest caused by high temperature burns - he had a bad heart to begin with.
"Who bought the balloons?" Bai Song asked.
"It was bought by the deceased's daughter. The child originally wanted to celebrate her father's birthday with him, but Yao had to go out drinking, so the daughter bought a bunch of balloons, a cake and candles, and then went back to school." Criminal policeman Xiao Zhao explained to Bai Song.
"How many balloons? What kind of balloons are they?" Bai Song asked.
"About twenty of them, the size of ordinary balloons."
"So little?" Bai Song said, "The explosion limit of hydrogen is 4% to 75.6%. It won't explode if the concentration is lower than this. From the scene, this single room is about 11 square meters and 2.7 meters high, which is about 30 cubic meters. At least 1.2 cubic meters of hydrogen is needed, but these 20 balloons only have 0.1 to 0.2 cubic meters of hydrogen, which is an order of magnitude difference. Why did they explode?"
"No?" Xiao Zhao asked.
"What do you think?"
Bai Song asked this question, and Xiao Zhao and the people around him also reacted. This thing was learned in junior high school or high school, and it seemed to be like this.
Previously, everyone suspected that the daughter who bought the balloon was the suspect. If that were the case, hydrogen might not be the main cause of the accident at all.
This alone is enough to file a case.
"Well..." Xiao Zhao said, "I will go and talk to the leader about this situation now."
"Don't worry," Bai Song shook his head. "Hydrogen balloons are floating in the sky, and they won't explode for no reason. Even if a few of them break and float near the roof, they can't be ignited. Let's not consider this issue for now. Let me ask you, where is the autopsy report of the deceased?"
When Sun Jie heard this, he immediately stepped forward and waited for the result.
"The results haven't come out yet, there's only a provisional report, and the autopsy is still ongoing." Xiao Zhao thought for a moment and said, "The cause of death should be a heart attack caused by the burns."
"Brother Jie, follow the people here and help." Bai Song said to Sun Jie, then looked at Xiao Zhao and said, "Please call another person to take our forensic doctor to find out what's going on over there."
"Okay, leader," Xiao Zhao took out his cell phone and made a call.
Taking advantage of this opportunity, Bai Song asked Sun Jie, "Brother Jie, can burns cause heart disease?"
"If you already have a history of heart disease, then many external factors can cause it." Sun Jie said, "But burns themselves are not that easy to die from. Even if oil is poured on the body, the human body can survive for a few minutes. Of course, after five minutes, even if you are still alive, it's too late to save you."
"Does this person have a history of heart disease? Where are the medical records?" Bai Song then asked Xiao Zhao.
"Wait a minute, let me ask..."
Five minutes later, someone came with the medical record. Sun Jie looked at the record and followed the man to do the autopsy.
"Huadong, go to the scene again and be careful. I'll give you enough time." Bai Song didn't say anything to the Huadong Tizhuang Detachment, nor did he urge Wang Huadong.
After saying that, Bai Song then looked at Liu Shuyuan and said, "Captain Liu, if you are okay, go help Wang Huadong."
"good."
Wang Liang watched the three people leave and looked at Bai Song eagerly.
Bai Song then looked at Xiao Zhao.
Xiao Zhao inexplicably felt guilty. He was the police officer who knew the most about the case, but why did he get scared when Inspector Bai asked him a question?
"Inspector Bai, just ask if you have any questions." Xiao Zhao asked first.
"Is the video coverage of this place very good? Why were you so sure about the video before?" Bai Song was a little confused.
Before coming here, he heard that through video recording, it can be confirmed that no one approached the house for a period of time before the death of the deceased. Why can they be so sure? Bai Song also looked around the rental house, and the camera could not guarantee that there were no blind spots.
"That's right, Chief Bai," Xiao Zhao finally had his own affirmative answer, "These places are where the workers live. Because there have been several thefts in the past, in order to prevent similar incidents from happening again, there are a lot of cameras here, and basically there are no blind spots. The main reason is that they all use wide-angle cameras. From the surface of the camera, it seems that some places are blind spots, but in fact they do not exist."
"Wide-angle camera? With infrared?" Wang Liang asked.
"I brought it." Xiao Zhao nodded affirmatively. He could also answer this question. It felt comfortable.
"Then how do you solve the problem of distorted images taken by the infrared wide-angle camera? Have you done distortion correction?" Wang Liang asked.
"Ah?" Xiao Zhao's eyes widened and he felt sick.
What the hell?
"Captain Wang, if you have time, go to their image detection department to learn from them." Bai Song said to Wang Liang.
"Okay." Wang Liang nodded and left.
"That's all I know, Inspector Bai. The materials are all here. Please take a look at them yourself. If there is anything you need to supplement... just tell me and I'll ask someone to check it out." Xiao Zhao didn't dare to ask him again if he didn't understand.
"Okay," Bai Song said with a warm face, "It's just a small case. Let's cooperate and learn from each other... Um... Let me take a look at the transcripts of everyone, including the deceased's children, several people who had dinner with him before his death, all of the deceased's subordinates, his ex-wife, his boss, other contractors, and related suspicious persons."
"Only part of it, the rest is not found yet..." Xiao Zhao almost fell to his knees: "Please take a close look at the transcript. If you have any questions, please tell me. I'll take the notebook and write it down."
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